M
- M-wing
- Mach number
- machine-readable passport
- machine-readable travel document
- macroburst
- magnetic compass
- magnetic compass error
- magnetic equador
- magneto
- mail hub
- main rotor
- main rotor blade
- maintenance
- maintenance programme
- maintenance release
- maintenance shop
- maintenance workshop
- major change
- major modification
- major overhaul
- major repair
- maneuverability
- maneuvering area
- maneuvering speed
- manifest
- manifold pressure
- marker beacon
- marking
- marshaller
- mast
- master connecting rod
- master minimum equipment list
- mat
- maximum all up weight
- maximum certificated take-off mass
- maximum continuous power
- maximum flap extended speed
- maximum landing gear operating speed
- maximum landing weight
- maximum performance takeoff
- maximum ramp weight
- maximum take-off power
- maximum take-off thrust
- maximum take-off weight
- maximum threshold speed
- maximum zero fuel weight
- mayday
- mean aerodynamic chord
- mean sea level
- mean time between maintenance
- mean time to repair
- medical certificate
- medium frequency
- medium intensity approach light system with runway alignment indicator lights
- memorandum of understanding
- Mercator projection
- mercator track
- meridional index
- METAR code
- meteorologic front
- meteorological balloon
- meteorological briefing
- meteorological element
- meteorological information
- meteorological instrument
- meteorological message
- meteorological network
- meteorological observation
- meteorological observing station
- meteorological pilot balloon
- meteorological satellite
- meteorological service
- meteorological station
- meteorological symbol
- meteorological watch office
- microburst
- microburst and severe thunderstorm
- microwave landing system
- mid-air collision
- mid-wing monoplane
- middle marker
- military aerodrome
- military aircraft
- minimum crossing altitude
- minimum descent altitude
- minimum descent height
- minimum en-route altitude
- minimum equipment list
- minimum flying speed
- minimum glade path
- minimum glide path
- minimum holding altitude
- minimum obstacle clearance altitude
- minimum obstruction clearance altitude
- minimum reception altitude
- minimum safe altitude
- minimum safe altitude warning
- minimum sector altitude
- minimum sink speed
- minimum vectoring altitude
- minor alteration
- minor modification
- minor overhaul
- minor repair
- mishandled baggage
- missed approach
- missed approach holding point
- missed approach point
- missed approach procedure
- missed approach segment
- mist
- mock-up
- moderate drizzle
- modification
- moist-adiabatic lapse rate
- moist-adiabatic process
- moist-saturated adiabatic lapse rate
- moist-unsaturated adiabatic lapse rate
- moisture
- mongolfier
- monoplane
- monopulse secondary surveillance radar
- montgolfier
- mooring cone
- mooring point
- mooring spindle
- motor glider
- mountain wave
- movement area
- moving target indicator
- MSL
- multi-crew pilot licence
- multi-engine aeroplane
- multi-engined airplane
- multi-pilot aircraft
- multi-sensor navigation system
- multifunctional display
- multiplane